These are Offensive and Defensive Efficiency Rankings based on Shots and Goals with penalty kicks removed.

Offensive Rank = Goals Scored / Shots Taken

Defensive Rank = Goals Allowed / Shots Allowed

Its probably not a surprise that RSL is in the upper tier of both...

Offensive Efficiency  (Goals Scored/ Shots Taken)

1st:  Rapids (.190)

2nd:  Sporting KC (.185)

T-3rd:  RSL (.167)

T-3rd:  Toronto FC (.167)

5th:  Whitecaps (.148)

6th:  Fire (.130)

7th:  Revolution (.125)

8th:  Chivas (.111)

9th:  Union (.100)

10th:  Galaxy (.094)

T-11th:  Earthquakes (.091)

T-11th:  DC United (.091)

13th:  Dynamo (.050)

14th:  Timbers (.048)

15th:  Red Bulls (.043)

16th:  FC Dallas (.034)

17th:  Sounders (.021)

18th:  Crew (.000)

Defensive Efficiency  (Goals Allowed / Shots Allowed)

T-1st:  Union (.000)

T-1st:  Red Bulls (.000)

3rd:  Earthquakes (.034)

4th:  RSL (.040)

T-5th:  DC United (.048)

T-5th:  Revolution (.048)

7th:  Dynamo (.061)

8th:  Rapids (.077)

9th:  Sounders (.094)

10th:  Crew (.095)

11th:  Whitecaps (.115)

12th:  Toronto FC (.125)

13th:  Galaxy (.133)

14th:  Chivas (.148)

15th:  Fire (.150)

16th:  FC Dallas (.167)

17th:  Sporting KC (.190)

18th:  Timbers (.217)

I know this is only a rough idea of efficiency, but we'll see where it goes as the season goes on and more shots are taken and goals are scored.  Here are the Top and Bottom 4 teams based on the average of their offensive and defensive rank:

Top 4 (Best to Worst):  RSL, Rapids, Union, Revolution

Bottom 4 (Worst to Best): Timbers, FC Dallas, Crew, Sounders

Thoughts?